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Maturities of Marketable Securities Available-for-Sale (Detail) $ in Thousands | Sep. 30, 2018 USD ($)
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Amortized Cost |
Mature in one year or less | $ 141,603
Mature after one year through two years | 0
Total amortized cost | 141,603
Estimated Fair Value |
Mature in one year or less | 141,509
Mature after one year through two years | 0
Total estimated fair value | $ 141,509

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